42 KEPOET OF SEARCH FOE ENEMIES OF CITEUS WHITE FLY. 



The citrus white fly has other host plants than the varieties of 

 citrus, and below is given a list of its definitely known food plants 

 as taken from Bulletin 92 of this bureau, page 29: 



Definitely known food plants of the citrus white fly (Aleyrodes citri). 



Class I. Preferred. 

 Introduced: 



1. Citrus (all species cultivated in America). 



2. China tree {Melia azedarach). 



3. Umbrella China tree {Melia azedarach umbraculifera) . 



4. Cape jessamine {Gardenia jasminoides) . 



5. Trivets {Li gustrum spp .) . 



6. JsiTpan -persiuimon {Diospyi'os kaki) . 



7. Lilac {Syringa sp.). 



8. Coffee {Coffea arabica). 

 Native: 



9. Prickly ash {Xanthoxylum clava-herculis) . 



10. Wild persimmon {Diospyros virginiana) . 



Class II. Occasionally Infested. 

 Introduced: 



11. Allamanda {Allamanda neriifolia). 



12. Cultivated pear {Pyrus spp.). 



13. Banana shrub { Magnolia fuscatum). 



14. Pomegranate {Punica granatum). 

 Native : 



15. Smilax {Smilax sp.). 



16. Cherry laurel {Prunus laurocerasus) . 



17. Wild olive or devil wood {Osmanthus americanus) . 



18. Yihnmnm. {Viburnum nudum.) 



19. Green ash {Fraxinus lanceolata). 



The bulletin just referred to goes on to say that in addition to those 

 of the foregoing list there are several species reported as food plants 

 of the white fly which, although probably true food plants, can not 

 consistently be included in the recognized list until the observations 

 have been repeated and the infesting species positively identified. 



Authorities on the white-fly situation in this country appear 

 agreed that the economic control of this insect necessitates proper 

 attention to different food plants. It can then be seen that in case 

 a citrus orchard was so treated that the fly was eradicated therefrom, 

 the presence of other species of infested food plants in the immediate 

 neighborhood which might escape treatment would .furnish a direct 

 source for its reinfestation. Kjiowledge of the different kinds of 

 food plants would readily enable the horticulturist to determine 

 before treatment whether or not his sole efforts could be devoted to 

 his orchard trees. 



As the white fly is an introduced pest it has also been conceded 

 that knowledge of the different preferred food plants might Lssist 

 materially in the discovery of the original host plant as well as indi- 

 rectly the original home of the insect. Practically all investigators 



